1. Iron making industry

Seven Refractories Brochure Iron-making Industry



Blast furnace lining engineering

The high capital investment of blast furnace relines mandates that iron makers pursue the longest possible campaign life.

While the hearth remains the most critical zone for repair, the stack can always be re-profiled. Robotic repairs or manual installation by lifting platform are the usual, long experienced techniques used worldwide.

Furnace life extension is optimized by advanced engineering refractory products.

Engineering support is provided for product selection and turn key installations based on extensive international experience.

The blast furnace service life extension, the environmental issues and the costs reduction are aims of an open and mutual vision.

Seven Refractories offers a complete range of monolithic and precasted shape products suitable for any blast furnace repair.

Casthouse engineering

Casthouse performance is determined by runner and through design, product engineering and application technology. Seven’s main focus is to provide reliable high alumina and silicon corbide/carbon products for all refractory linings

Working lining characteristics

  • Designed for long campaign service life
  • Low, ultra-low cement and cement-free castables
  • Brown fused alumina and silicon carbide base
  • Highly erosion resistant
  • Slag resistance
  • Thermal cycling resistant
  • Low cracking behaviour
  • Pitch-free and no toxic emission

Safety lining characteristics

  • Long service life
  • No crack formations
  • Oxidation resistant
  • Iron and slag corrosion resistant
  • High mechanical properties
  • Casted on site or supplied in precasted blocks
  • Designed for zoned lining
  • Pitch-free and no toxic emission

Seven Refractories offer different lining solutions for your casthouse based on layout, installation technique, experience and user preference.

Seven Cast Regular, low and ultra-low cement vibrating castables for any application
Seven Flow Self-flowing low and ultra-low easy to install castables
Seven Gun Dry dense and regular hydraulic mixes for all general maintenance
Seven Ram Ramming mix chemically and ceramic bonded mixes for any kind of application
Seven Plast Shaped plastic chemically and ceramic bonded mixes for special applications
Seven Shot Low and ultra-low cement spraying castables for dedicated quick lining and repairs
Seven Grout Hydraulic and chemically bonded self-fl owing mixes used for hot and cold injection
Seven Dry Special dry chemically bonded mixes for dedicated applications
Seven Cem Special chemically bonded mortar for jointing precasted blocks and bricks lining
Seven Shape Special ready shapes dried blocks for special uses
Seven Tap Taphole clays


linea tape hole
Cast rate, corrosion resistance and balancing the taphole wear and the renewal of the “mushroom” are all aspects creating synergy between the user’s demand and the producer’s capability.

Special attention is paid to the taphole design and manufacture to ensure stable blast furnace operation and protect the hearth walls.

Seven Refractories taphole clay is the answer to:

  • Daily iron production of up to 12,000 t/d
  • Short intermediate tapping tap time, 20 mins
  • Long operation on the same hole, more than 20 days
  • Easy drilling at the scheduled time, no O2
  • Long stable taphole length, > 1/3 H
  • Low plugging consumption: 3 times (r*r*π*L)
  • Long cast duration, up to 200 mins
  • Low emission into the atmosphere
  • Controlled cast rate

Seven clays are designed for any type of mudgun. Their binding system has an improved temperature threshold preventing hardening in the mudgun barrel and cone.

Four families of products for different requirements have been designed:

Seven Tap 100 suitable for little blast furnace
Seven Tap 200 is engineered for consistant performance in small and medium sizes blast furnaces.
Seven Tap 300 a higher content for anti-abrasives increases the taphole performance and makes it more suitable for medium and large blast furnaces.
Seven Tap 400 is the top grades of the range where the high content os SIC, Si3N4 and carbon make the products suited to extreme operating blast furnace conditions.


All taphole clays are eco-friendly resin bonded based on high aluminia  raw materials.

Fast curing and low emision to the atmosphere ensures the clay asheres to the EC legislation. No special labeling is required.


Seven Refractories Taphole clay flyer

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